Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a573c3a4798429b…

MALICIOUS

PDF

71.3 KB Created: 2021-01-28 05:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 36b90582fc9e622f6570c3b6c0de257e SHA-1: 9367714fa809f352a66c26e76881c4be9c9af0ab SHA-256: 5a573c3a4798429bf16f99492b2c9a8c498f55ab861a3c9b0e09e6c3afda2d0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=mathematical+proofs+pdf+chartrand'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'mathematical proofs pdf chartrand'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=mathematical+proofs+pdf+chartrand In PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_5ffd5423993bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_600b5ca4ca527.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/dghFSxy/pikiporulapavajaxupa.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/hdjhtqq/car_racing_2_player_games_y8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_6002d090f1213.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/7hezicr/hsbc_coin_counting_machine_near_me.pdfIn PDF document text
    • http://oneshops.space/gunaroks8br3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_5fcf46587a388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421782/normal_5feb845458e4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495694/normal_5fde1e80b3fbb.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/Qfghvge/49096083655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/20178018870.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/adapted_books_in_english_free.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/billiards_game_for_windows_8.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 5400 bytes
SHA-256: aaf94755c8486ffdec6a70ff8109fed268f76a4540d3036dc92a4c5719b22d48
font_01_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10940 bytes
SHA-256: fa9384b8b61d2f3633ee07853076f295b6c229361d7e956972eda136b7e0852b

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